The third generation EV technology system: Its technical strategy and benefit:
EV3.0 technical parameters far exceed those of EV1.0 and EV2.0, due to its complete different technical strategy. But what is the EV3.0 technical strategy?
1. Both EV1.0 and EV2.0 define EV as a electric version of fuel vehicle. So except the powder system, the rest should be the same as fuel vehicle. So their design starts from the vehicle itself and design matching battery and electrical system accordingly. For EV3.0, on the other hand, the design starts from the characteristics of battery, maximally use the battery characteristics, and design the whole vehicle and electric systems based on the characteristics of battery.
2. Battery, under the conditions of low currency discharge and low temperature increment, can maximize its shelf life and safety. These two points, are the keys to the life or death of electric vehicle. Therefore the EV technology should set both low currency discharge and low temperature increment as two prerequisites to plan electric reserve (battery), electric motor, and electric control (or 3E). The key parameter will be C/P ratio: battery capacity versus power output.
LEAF and Tesla model have C/P ratio of 0.56:1 and 0.71:1, respectively. But based on battery characteristics, the C/P ratio should be more than 2:1 to maximize safety and shelf life of battery. EV1.0 and EV2.0 do not meet this requirement.
3. There are only two ways to increase C/P ratio: either increase battery capacity or reduce motor powder. Increasing battery capacity should consider that battery weight not exceed 25% of body weight by increasing battery energy density. Lowering motor power should consider two requirements: the maximal speed not less than 130 km per hour, acceleration from 0 to 100 km should be less than 15 seconds.
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